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Find the 20th term of an …

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Find the 20th term of an Ap whose 3rd term is 7 and the seventh term exceed three times the 3rd term by 2 also find its nth term (an)

Posted by Shrikant Ingle 6 years ago

CBSE > Class 10 > Mathematics

3 answers

Sanket Arjun 6 years ago

añ=-1+(n-1)4 || añ=4n-5

Sanket Arjun 6 years ago

a20=(-1)+19(4). ||. a20=75

Sanket Arjun 6 years ago

A/q a+2d=7 || a+6d-3(7)=2 || a+6d=23. || Subtract eq (1) from eq(2). ||. a+6d-a-2d=23-7. ||. 4d=16 || d=4. ||. So,a=-1

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