find the number of different possible A.P's of 5 terms from first 20 natural no.
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Find the number of different possible A.P's of 5 terms from first 20 natural number....solve it guys - 28153641.
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different APIs of 5 terms may have common difference + - 1 + - 2 + - 3 or + - 4
number of APS with common difference + - 1 is equal to 16 × 2 = 32
number of a APs with common difference + - 2 is equals to 12 * 2 = 24
number of APS with common difference + - 3 is equals 8 ×2 = 16
number of APS with common difference + - 4 is equals to 4 ×2=8
hence total ap = 32+24+16+8=80
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