समांतर श्रेणी - 11,-8,-5,....49 का अंत से चौथा पद ज्ञात कीजिए
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Answer:
n= 22
Explanation:
formula for finding last term in A.P.
l=a+(n-1)*d
l=49
a=-11
n=?
d= -8-(-11) = 3
getting the value in formula .
49=-11+(n-1)*3
60=(n-1)*3
20=n-1
n=21 ANS
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