Question

7) if 3+5+7+............ to n terms = 5+8+11........... are in ap

Answer 1

Explanation:

P=3+5+7+...(n terms)

a=3

d=5-3=2

∴P=2n[2.3+(n−1)2]=n2+2n

Q=5+8+11+...(10 terms)

a=5

d=8-5=3

∴Q=210[2.5+(10−1)3]=185

∴QP=7

⇒185n2+2n=7

⇒n2+2n−1295=0

⇒(n−35)(n+37)=0

∴n=35

Answer 2

Answer:

Explanation:

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