Question

ATE
If first and last term are 5 and 45
Respectively. If
terms
and
Sum
of its terms is 400.
the
find d?​

Answer 1

Given, a=5

l=45

Sn=400

Sn=n/2 (first term+last term )

400=n/2 (5+45)

800=n(50)

800/50=n

16=n

Now...

a16= a+(n-1)d

45=5+(16-1)d

45-5=15d

40/15=d

2.67=d

HOPE IT HELPS...

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