yhe first term of ap is - 5 and the last term is 45 and the sum of their terms is 120. Find the difference aand the number of terms??
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sum of terms=n/2(a+l)
120=n/2(-5+45)
n×40=120×2
40n=240
n=6
an=a+(n-1)d
120=-5+5d
125=5d
d=125/5
d=25
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