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Find the 20th term from the …

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Find the 20th term from the last term of the AP 3,8,13,......253

Posted by Shivam Gupta 6 years, 11 months ago

CBSE > Class 10 > Mathematics

7 answers

Saigeetha Godavarthi 6 years, 11 months ago

a child puts one 5 rupee coin of her saving in the piggy bank on the first day,

Ram Kushwah 6 years, 11 months ago

253=3+(n-1)×5

n-1=250/5=50

So n=51

So 20th term from last is 51-20+1=32nd term

a32=3+31×5=158 and

Yogita Ingle 6 years, 11 months ago

a = 3, d = 5

Now, 253 = a + (n + 1) d

⇒ 253 = 3 + (n -1) x 5

⇒ 253 = 3 + 5n – 5

⇒ 5n = 253 + 2 = 255

⇒ n = 255/5 = 51

Therefore, 20th term from the last term = 51 – 19 = 32

a₃₂ = a + 31d

= 3 + 31 x 5

= 3 + 155
= 158

Thus, required term is 158

Ram Kushwah 6 years, 11 months ago

a20=a+19d

=3+19×5=98

Lionel Messi⚽️ 6 years, 11 months ago

The 20th term is 158 .

Honey ☺☺☺ 6 years, 11 months ago

158

Shivam Gupta 6 years, 11 months ago

158

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