length of dna having 23 base pair is:-(a)78Angstrom (b)78.4 (c)78.2

10 base pair have length of 34 A° So length of 1 base pair is 3.4 A° Thus length of 23 base pair is 3.4 × 23 = 78.2 A°

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the answer should be option  C .. 1 bp is of 3.4 armstrongs ....and 23 bp will be of 3.4 * 23 = 78.2 
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