Math, asked by shikha6336, 1 year ago

the sum of 2nd and 7th terms of an ap is 30. If it's 15th term is 1 less than twice its 18th term ,find the AP

Answers

Answered by Anonymous
2

hey buddy...

thank you for question....

here's your answer...

t2+t7=30

t15-1=t18

t15+t18=1

t2+t7=30

a+8d+a+(n-1)=30

2[a+8d]=30....(1)

similarly

2[a+32d]=1...(2)

subtract (1) &(2)

a+32d=1

a+8d=30

__________

0+24d=-29

d=-29/24

substitute d=-29/24 in (1)

you'll get a

in such way u can find an A.P

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