. If the common difference of an AP is 8 then a20 - a16 is
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We know that,
an=a+(n-1)d
So,a20=a+(20-1)(8)
a20=a+19(8)
a20=a+152
Similarly, a16=a+15d
a15=a+15(8)
a15=a+120
Now,a20-a16=(a+152)-(a+120)
=a+152-a-120
=152-120
=32
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