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The first tetm of an A.P …

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The first tetm of an A.P is 5 and the last term is 45 and the sum is 400 . Find the number of terms and the common difference

Posted by Rani Mishra ??? 5 years, 8 months ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 5 years, 8 months ago

S_n = n/2(a_n + a)
400 = n/2(45 + 5)
800 = 50n
n = 16
a_n = a + (n-1)d
45 = 5 +15d
40/15 = d =8/3

0Thank You

Sanaya Sharma ???? 5 years, 8 months ago

N=16 d= 8/3

0Thank You

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