in an a.p if a=-18.9,d=2.5 and last term is 3.6 find the number of terms
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just apply the formulae man a+(n-1)d=3.6
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_______________________________________a=-18.9,d=2.5 ,a(n)=3.6
we know what:
a(n)=a+(n-1)d
3.6=-18.9+(n-1)2.5
2.5n-2.5=3.6+18.9
2.5n=3.6+18.9+2.5=25
n=25/2.5=250/25=10
n=10
_______________________________________
please mark me brainliest
we know what:
a(n)=a+(n-1)d
3.6=-18.9+(n-1)2.5
2.5n-2.5=3.6+18.9
2.5n=3.6+18.9+2.5=25
n=25/2.5=250/25=10
n=10
_______________________________________
please mark me brainliest
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