Question

The 24th term of AN A.P IS TWICWE IT 10TH TERM .SHOW THAT 72TH TERM IS 4 TIMES IT'S 15TH TERM.

Answer 1

a+23d=2(a+9d)
-a=18d-23d
a=5d
to prove :
a+71d=4(a+14d)
put a=5d
if LHS=RHS..THEN IT WILL BE PROVED
5d+71d=4(5d+14d)
76d=4(19d)
76d=76d
proved

Answer 2

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